Before Christmas I came across a message from Rita Kopp dated Sat. 19th May 2007 which I now can't find so I'm posting all the information I wrote down here.
No.390 [Cornish-gen] Weekly newspaper 2 June 1843 BMD [0.162 782] from The West Briton Newspaper for 2nd June 1843 Friday.
"On the 21st of October, at Rang[?] New Zealand, the wife of Robert St.Aubyn, Esq., a daughter."
The daughter's name was Winifred Maria St.Aubyn, Robert's eldest child, her mother was Lavinia Sophia Leicester b.1814 d.1847 the 1st wife of Robert St.Aubyn. They married in 1840. Lavinia possibly died as the result of child birth as her other daughter Francis was born in 1847.
Winfrid died unmarried in 1900. She was the great-grandaughter of Sir John St.Aubyn and Martha Nicholls.
Jill.